The misconduct hearing panel also ruled that PC Christopher Frost touched another colleague on the bottom, just two days later.

The officer faces the possibility of being sacked from Derbyshire Constabulary tomorrow. That's when members of the misconduct hearing panel that has heard his case at the force's headquarters in Ripley are expected to make their decision on what action will be taken against him.

PC Frost and a female officer engaged in sexual activity in the back of a police van after dealing with a domestic violence incident in Derby last year, the panel has ruled. And, two days later, a female officer was shocked when he touched her on her bottom.

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The panel said the officer behaved "inappropriately" and said this was "discreditable conduct".

After the ruling, the PC, who is married with children, broke down in tears and spoke to the panel asking them to allow him to keep his job. He said: "I have let myself and my family down. I ask everyone to forgive me for my actions.

"I have been a police officer since 2005. I'm extremely proud to be a police officer. I'm proud to represent Derbyshire. It's a great source of pride."